cert_installer is a utility that adds a CA certificate to Android's System Trust Store by overwriting the /system/etc/security/cacerts directory with a tmpfs mount. Changes made to the System Trust Store is not persistant across reboots.

The CA certificate is valid for 360 days and needs to be updated before it expires. Generating a new CA certificate can be done with the following command:

openssl req -x509 -new -nodes -keyform der -key ca_key.der -sha256 -days 360 -outform der -out ca_cert.der -config ca.cnf

The current certificate has the following validity period:

Not Before: Mar  5 12:12:15 2022 GMT
Not After : Feb 28 12:12:15 2023 GMT